From the Pre desktop, with no applicatons open on the Pre, type in the Konami code on your Pre's keyboard. (upupdowndownleftrightleftrightbastart) to access the developer mode application. You do not need to press enter. When you press the "t" of start, the developer app will become visible.

Open the DeveloperMode application on your Pre and enable the developer mode switch, resetting the device when prompted.

Connect to your computer via USB cable. There is no need to answer the question on your Pre regarding mounting the drive or just charging. Don't select anything (or select "Just Charge" if not selecting anything really bothers you). Warning: Selecting a USB mode will turn off the Pre's WiFi & Cellular connections and mess up later steps by giving you a "wget: bad address" error when you try and install additional packages.

Next Steps:

Your Linux-accessible pre is in a very sensitive and unusual state. There are several steps you should take immediately:

Create a new username and password so that you don't have to connect as root

Open up ports in the pre so that you can connect to it.

Create a secure connection so that your pre is not open to everyone in the universe. **If you do not secure the network, your device will be accessible by anyone on the internet until it is rebooted.**

Install the Optware package manager so that you can install software onto the Pre.